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what does sielding mean??


#91317 01/08/03 09:59 PM
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>sielding = shielding

just a typo, then.


#91319 01/08/03 10:04 PM
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WW,

Fe = iron, probably*, and
PMT = photomultiplier tube

* When I worked in an atomic physics lab they used a special type of metal to keep magnetic fields out of the experimental area. Very expensive. It was called mu-metal (as in the Greek letter mu which is used to represent the magnetic permeability). Maybe the Fe-shielding is similar.


#91321 01/09/03 02:26 PM
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Maybe the Fe-shielding is similar

Soft iron will shield, to some extent, against magnetic fields. Probably not as welly as mu-metal, but if the application isn't as senstive, probably well enough.


#91323 01/09/03 02:45 PM
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It has to do with the magnetic properties of the metal. Lead isn't magnetic. So it can't be used to shield from magnetic fields. Iron is magnetic. Mu-metal is probably some fancy alloy. Super-duper expensive.

You're probably thinking of radiation shilding. A whole different ballgame. In that case they do use lead. And depleted uranium. Edit: and concrete, and heavy concrete. And other stuff.


#91324 01/09/03 02:52 PM
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heavy concrete

Is that concrete they made using heavy water?


#91325 01/09/03 03:03 PM
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I don't remember what's in it and since it was my last degree that was in medical physics, my radiation protection course notes are at home. I don't know what makes it heavy. For that matter, it might be called dense concrete. Anyway, it's expensive but you need less of it for a given amount of shielding.


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